Tripping device



W. M. AUSTIN.

TRIPPING DEVICE.

APPUCATIDN FILED JUNE :9, 1918.

1,408,243. Patented Feb. 28, 1922.

2 SHEETS-SHEET l- INVENTOR AT'I ORNEY W. M. AUSTIN.

THIPPING DEVICE.

APPLICATON HLED sun: 19. I918.

Patented Feb. 28, 1922.

2 SHEEIS-SHEET Z- WALTER m. A'Us'rm, or SWISSVALE, rmmsynvanm', ssxonon 'ro .wnsniianzousn ELECTRIC & MANUFACTURING CQMEA'NY, A CORPORATION OF: PENNSYLVANIA- TRIPP ING DEVICE.

' Application filed June 19,

To all whom itmay co'iwem: I

Be it known that'I, WALTER M. AUSTIN,

a citizen of the United'states', and a resident of Swissvale, in the"connty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Tripping Devices, ofwhich the following is a specification.

My invention relates to tripping devices and particularly to overload and reversecurrent tripping devices for circuit interrupte'r's.

One object of my invention 'is toprovide an overload and reverse-current tripping device that shall have only a single voltage and a single cnrrent'operating coil.

Another object of my invention is to provide a magnetizable member for a tripping device, of the above indicated character, that shall be of such shape as to co-operate with a polarized armature to positively actnate the armature in two directions in accordanc with the'direction of flow of current through the interrupter.

Another object of my invention is to pro vide a magnetizable member, of the above indicated character, that shall actuate a second armature under predetermined overload conditions.

A further object of my invention is to provide a device of the above indicated character that'shall 'be inexpensive to construct, applicable to existing types of circuit i-nterruptersand effective in its opera tion.

In p'i-acticino' my invention, I provide a current and a voltage .coil that areoperatively connected to the circuit interrupter. An armature is loosely mounted in the voltage coil. A magnetizable member is induc tively connected to the current coil and has two arms that are of such-shape as to constitute poles at the respective ends of the armature, on opposite sides thereof. A second armature is adapted to 'co-operate 'with the poles on the underside of the first-mentioned armature and is so adjusted that it will be attracted underpredetermined overload conditions. The first mentioned armature is polarized by the voltage coil and is thus maintained positively in one position, under normal conditions, and is positively attracted in the opposite direction to another position when the current traversing the voltage coil reverses.

Specification of Letters Patent. Patented Feb. 28-, 1922.

1918. Serial in. 240335;.

In the 'accompanying dravvings, Fi lis,

a side view, partially in section an par tially in elevation, of. a; circilitfinterrupter embodying my invention view, partially in section an paitially'in elevation, of the circuit, interrupter'showfn' in Fig.1, Fig. S'jis ifra mentaryisideeld vational view of a 'nioglifi'ethfomi fr'tr'i'p; ping device embodying'mydiiveiition. Fi .4 is a detail 'vieivof the magnetizable mem ers and their co-operating armatures, in assembled relation I Fig. 5 is'a detailfvieiv of'a portion'of one of the magnetizable members, an f Fig, dis a view looking; from the top of'hig. 5. r j

A circuit interrupter 1 is mounted on a 2 is a front panel board 2 and' comprises, in general, two

stationary main contact members '3aiid 4', a main bridging contact member 5, sup porting arm (5 arm 7 and a lat'chingdevice 8.

A current coil '91s disposed between the therefor, ,an operating'lever brackets lO upon which the operating-lever arm is mounted andisso connectedto tlie stationary contact m ember; soda stud ll- F as to he traversed by'the c'urre'nt traver'sm the interrupter 1." The coil 9" 1s disposed around a core member 12- to the endsof which are connected magnetizable' members 13 and 14. Themagnetizable member-13 is of such shape that lliCOIlSizlhltGS a pole 15"- at one end of a voltage coil 16 and extends behind thevoltage corYIGland to the oppo site end thereof to form a second pole 17. Similarly, the magnetizable member 1 1 mm: stitutes a pole 18- opposite end thereof and constitutes a pole 19 adjacent the pole15. f i

A magnetiaable armature 20 is loosely disposed in the opening in the voltage coil 16 between the poles l5 and'19 audit} and 17. respectively, and is supported bya lever arm 21 that is pivotally mounted on bracket 22 on the portion 23 of themagne ti'z able member 14. The member 21 is provided with a counter-weight member 24 that is adapted to be moved by a screw-threaded mem er 25 to any position therenlong for the purpose of calibrating the device. The counter-Weight member 24 cooperates with a s ale 26 to indicate the setting of the derice.

The poles l7 and 19 of the members l3 at one 'end ofthe coil 16' and extends in front of the coil 16 to the and 14, respectively, extend downwardly to constitute poles 27 and 28 that are adapted to attract" an armature 29, under predeterminedconditions. The armature 29 is mounted on a lever arm 30 that is pivotally mounted on a bracket 31 and is provided with a counter-weight 32 that is adapted to be adjusted'by a screw-threaded member 33 with respect to a scale 34. The stationary member 35 of a dash-pot36 is supported on a projection 3'1, and the movable. member 38 'ofithe; dash-pot is operatively conneo gd to the lever arm 30. If it is not desired to retard the time of operation of th'eerinature 29,: the dash-pot 36 may be omitted and a stopmember 39, substantially aslshown in Fig. 3 of the drawings, may be provided for-limiting the downward movement of the armature 29.

The. latching device 8 comprises a projection JelOon the operating lever arm 7 v and a latching member 41, that is pivotally mounted on the pin 42 in the brackets 10. A rod 43 extends .from a position adjacent one arm 44 of thelatch 41 to a position 46 adjacent the arm30, and a rod 45 extends to a poi nt;adjacent the arm 21. Thus, when the armatures 20 and 29 are actuated either byfa reversal of current traversing the circuitlinterrupter or by an overload therein, the latch .41 will be moved in a clockwise direction to thus release the projection 40 andpermit the circuit interrupter 1 to be tripped. 1 1 he essential feature of my invention is that themagnetizable members 13 and 14 severally constitute poles at the ends of the voltage coil 16 adjacent opposite sides ofithe-armature 20 and terminate in poles .27 and 28 that co-operate with an overload armature '29. The armature 20 is olarized by the voltage coil 16 and thus, if the voltage coil.16 'is properly connected, the armature will co-operate with the poles 17 and. 19 to be positively held in its lowermost position, under normal conditions of operation. When the current traversing the circuit interrupter 1 reverses, the polarityrof the poles 15, 17, 18 and 19 will reverse and thus the armature 20 will be positively actuated to its uppermost position to thereby actuate the rod 13 to trip the interrupter. By so forming the members 13 and 14, the armature is positively actuated to its proper osition in accordance with the direction of ow of current through the interrupter. W'hen the current traversing the interrupter exceeds a predetermined value, the poles 27 and 28 will attract the armature 29 to thereby, after a lapse of time that is dependent upon the setting of the dash-pot 36, actuate the rod 45 to trip the interrupter.

My invention is not limited to the spc cific device illustrated as it may be variously modified without departing from the spirit and scope of the invention as set forth in the appended claims.

I claim as my invention:

l. A reverse-current trippingdevice for a circuit interrupter comprising a current coil, a voltage coil, two magnetizable members inductively related to the current coil. and a laterally movable armature disposed in the voltage coil, said magnetizable members severally comprising two poles one above the armature at one end ,of the voltage. coil and one below the armature at the other end of the voltage coil.

2. A reverse-current tripping device for a circuit interruptercomprising a current coil, a voltage co1l,'two magnetizable members operatively connected to the current coil, and-a polarized armature disposed in the voltage coil,.- said magnetizable members severally being sogshaped :that they constitute two'poles, one above the armature at one end of the voltage coil and one below thpl armature at the other end of the voltage co k 3. A reverse-current tripping device for a circuit interrupter comprising a current coil, a voltage coil, two magnetizable members operatively connected to the current coil, and a polarized armature disposed in the voltage coil,;said magnetizabie members severally being so shaped that they coustitute two likeepoles, one below and one above the armature at opposite ends of the voltage coil. I 1

4. An overload-and reverse-current trip ping device for a circuit interrupter comprising a current coil, a voltage coil, two magnetizable members inductively related to the current coil, a movable armature disposed in the voltage coil, and a second movable armature, said magnetizable members severally being .So;shaped that they form two .pdles one above andgone-below the first armature at opposite ends of the voltage L'Oll, said second armature being adapted to co-operate with the poles below the first armature only, v i

5. A tripping device for a circuit interrupter comprising-a current coil, a voltage coil, two magnetizable members, an armature disposed in the voltage coil, and a second armature adapted to be attracted by the magnetizable members when a predetermined current traverses the current coil, said magnetizable members being so positioned with respect to the fiist armature that it is positively attracted in one direction normally and is positively attracted in another direction when thecurrent traversing the current coil reverses.

6. A tripping device for a circuit interrupter comprising a current coil, a voltage coil. a magnetizable member inductively assm'iaittl with the current coil, and an arms.

ture inductively associated with the voltage coil, said magnetizable member being of such shape that it forms a pair of unlike poles adjacent each end of the armature.

7. A tripping device for a circuit inter rupter comprising a current coil, a voltage coil, a magnetizable member inductively associated with the current coil, and an armature inductively associated with the voltage coil, said magnetizable member being of such shape that it co-operates with the arma ture to hold the armature in one position un der normal conditions and in another position when the current traversing the current coil reverses.

8. A tripping device for a circuit iIIiJBY- rupter comprising a magnetizable member havin two arms, means for inducing magnetic ines of force therein in accordance with the current traversing the interrupter, a voltage coil, and a pivotally mounted armature inductively associated With the voltage coil, said arms of the magnetizablc member being of such shape as to severally form a pole adjacent each end on opposite sides of the armature.

9. A tripping device for a circuit inter rupter comprising a magnetizable member having two arms, means for inducing mag netic lines of force therein in arcordance with the current traversing the lllttll'lllptti, a voltage coil, a pivotally mounted armature inductively associated with the voltage roll. and a second armature, said arms of the magnetizable member being of such shape as to severally form a pole adjacent each end on opposite sides of the first armature,

said second armature being adapted to cooperate with one pole adjacent each end of the first armature.

10. A tripping device for a circuit interrupter comprising a single voltage coil, :1 single current coil and means responsive to currents in said coils for tripping the interrupter in response to a change in value, and upon a reversal, of current in the interrupter, the said coils being operatively unrelated.

11. A tripping device for a circuit interrupter comprising two coils only and means responsive to current in the coils for tripping the interrupter in response to a change in value, and upon a reversal of current in the interrupter, the said coils being operatively unrelated.

12. The combination with two electromagnets only and an armature for each of the same, of means for so polarizing one of said magnets as to attract one of said armatures in response to currents therethrough in either direction, the other magnet being responsive to changes in the current therethrough to attract the other armature.

13. A tripping device for circuit interrupters comprising a single voltage coil, 2. single current coil, an armature for each of said coils and pole members related to both oi said coils to attract the said armatures upon a change in value or direction of the current in the interrupter.

In testimony whereof, I have hereunto subsrrihed my name this 29th day of May, i918.

l/VALTER M. AUSTIN. 

